2 * Ralink SoC specific prom routines
4 * Copyright (C) 2010 Joonas Lahtinen <joonas.lahtinen@gmail.com>
5 * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as published
9 * by the Free Software Foundation.
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/string.h>
16 #include <asm/bootinfo.h>
17 #include <asm/addrspace.h>
19 #include <asm/mach-ralink/common.h>
20 #include <asm/mach-ralink/machine.h>
21 #include <ralink_soc.h>
23 static inline void *to_ram_addr(void *addr)
27 base = KSEG0ADDR(RALINK_SOC_SDRAM_BASE);
28 if (((u32) addr > base) &&
29 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
32 base = KSEG1ADDR(RALINK_SOC_SDRAM_BASE);
33 if (((u32) addr > base) &&
34 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
37 /* some U-Boot variants uses physical addresses */
38 base = RALINK_SOC_SDRAM_BASE;
39 if (((u32) addr > base) &&
40 ((u32) addr < (base + RALINK_SOC_MEM_SIZE_MAX)))
41 return (void *)KSEG0ADDR(addr);
46 static void __init prom_append_cmdline(const char *name,
51 snprintf(buf, sizeof(buf), " %s=%s", name, value);
52 strlcat(arcs_cmdline, buf, sizeof(arcs_cmdline));
55 #ifdef CONFIG_IMAGE_CMDLINE_HACK
56 extern char __image_cmdline[];
58 static int __init use_image_cmdline(void)
60 char *p = __image_cmdline;
72 strlcpy(arcs_cmdline, p, sizeof(arcs_cmdline));
74 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
75 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
81 static int inline use_image_cmdline(void) { return 0; }
84 static __init void prom_init_cmdline(int argc, char **argv)
88 if (use_image_cmdline())
92 printk(KERN_DEBUG "argv=%p is invalid, skipping\n",
97 for (i = 0; i < argc; i++) {
98 char *p = to_ram_addr(argv[i]);
102 "argv[%d]=%p is invalid, skipping\n",
107 printk(KERN_DEBUG "argv[%d]: %s\n", i, p);
108 strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
109 strlcat(arcs_cmdline, p, sizeof(arcs_cmdline));
113 static __init char *prom_append_env(char **env, const char *envname)
115 #define PROM_MAX_ENVS 256
116 int len = strlen(envname);
120 printk(KERN_DEBUG "env=%p is not in RAM, skipping\n",
125 for (i = 0; i < PROM_MAX_ENVS; i++) {
126 char *p = to_ram_addr(env[i]);
131 printk(KERN_DEBUG "env[%d]: %s\n", i, p);
132 if (strncmp(envname, p, len) == 0 && p[len] == '=')
133 prom_append_cmdline(envname, p + len + 1);
140 void __init prom_init(void)
147 "prom: fw_arg0=%08x, fw_arg1=%08x, fw_arg2=%08x, fw_arg3=%08x\n",
148 (unsigned int)fw_arg0, (unsigned int)fw_arg1,
149 (unsigned int)fw_arg2, (unsigned int)fw_arg3);
152 argv = to_ram_addr((void *)fw_arg1);
153 prom_init_cmdline(argc, argv);
155 envp = to_ram_addr((void *)fw_arg2);
156 prom_append_env(envp, "board");
157 prom_append_env(envp, "ethaddr");
160 void __init prom_free_prom_memory(void)
162 /* We do not have to prom memory to free */